Table 5.

Personal history of autoimmune diseases and risk of MM with more than 5 years' latency

Category or condition	MM patients (n = 19 112)	MM controls (n = 75 408)	OR* (95% CI) [P]
Autoantibodies detectable	171	788	0.8 (0.72-1.00)
Systemic involvement	96	467	0.8 (0.6-1.00)
Rheumatoid arthritis	72	388	0.7 (0.6-0.9)
Autoimmune hemolytic anemia	0	0
Autoantibodies not detectable	111	366	1.2 (0.96-1.5)
Polymyalgia rheumatica	29	44	2.6 (1.6-4.1)
Giant cell arteritis	6	3	7.7 (1.9-31.0)

^*When no case patient or control subject has the specific condition, P values (2-sided) based on Fisher exact test are given.